docs: def parse_yaml_config(args):
      """Parse yaml config"""
      try:
          import yaml
      except ImportError:
          yaml = None
  
      yml = {}
      try:
          with open(args.coveralls_yaml, 'r') as fp:
              if not yaml:
                  raise SystemExit('PyYAML is required for parsing configuration')
              yml = yaml.load(fp)
      except IOError:
          pass
      yml = yml or {}
      return yml